TFA9881UK中文资料3.4 W PDM input class-D audio amplifier数据手册恩XP规格书

描述 Description

Overview
The TFA9881 is a mono, filter-free class-D audio amplifier in a 9-bump WLCSP (Wafer Level Chip-Size Package) with a 400 μm pitch.

The digital input interface is an over-sampled Pulse Density Modulated (PDM) bit stream. The TFA9881 receives audio and control settings via this interface. Dedicated silence patterns are used to configure the control settings of the device, such as mute, gain, Pulse Width Modulated (PWM) output slope, clip control and bandwidth extension (this control mechanism is not required if the default settings are used). The Power-down to Operating mode transition is triggered when a clock signal is detected.

The device features low RF susceptibility because it has a digital input interface that is insensitive to clock jitter. The second order closed loop architecture used in the TFA9881 provides excellent audio performance and high supply voltage ripple rejection.

特性 Features

Small outline WLCSP9 package: 1.3 × 1.3 × 0.6 mm

Wide supply voltage range (fully operational from 2.5 V to 5.5 V)

High efficiency (90 %, 4 Ω/20 μH load) and low power dissipation

Quiescent power:
6.5 mW (VDDD = 1.8 V, VDDP = 3.6 V, 4 Ω/20 μH load, fclk = 2.048 MHz)

7.8 mW (VDDD = 1.8 V, VDDP = 3.6 V, 4 Ω/20 μH load, fclk = 6.144 MHz)




Output power:
1.4 W into 4 Ω at 3.6 V supply (THD = 1 %)

2.7 W into 4 Ω at 5.0 V supply (THD = 1 %)

3.4 W into 4 Ω at 5.0 V supply (THD = 10 %)




Output noise voltage: 24 μV (A-weighted)

Signal-to-noise ratio: 103 dB (VDDP = 5 V, A-weighted)

Fully short-circuit proof across load and to supply lines

Current limiting to avoid audio holes

Thermally protected

Undervoltage and overvoltage protection

High-pass filter for DC blocking

Invalid data protection

Simple two-wire interface for audio and control settings

Left/right selection

Three gain settings: -3 dB, 0 dB and +3 dB

PWM output slope setting for EMI reduction

Bandwidth extension to support low sampling frequencies

Clip control for smooth clipping

Mute mode

‘Pop noise' free at all mode transitions

Short power-up time: 2 ms

Short power-down time: 5 μs

1.8 V/3.3 V tolerant digital inputs

Low RF susceptibility

Insensitive to input clock jitter

Only two external components required

应用 Application

Mobile phones

PDAs

Portable gaming devices

Portable Navigation Devices (PND)

Notebooks/Netbooks

MP3 players/Portable media players